Asymmetric Synthesis of α-Fluoro-β-Amino-oxindoles with Tetrasubstituted C–F Stereogenic Centers via Cooperative Cation-Binding Catalysis
作者:Sushovan Paladhi、Sang Yeon Park、Jung Woon Yang、Choong Eui Song
DOI:10.1021/acs.orglett.7b02628
日期:2017.10.6
Biologically relevant chiral 3,3-disubstituted oxindole products containing a β-fluoroamine unit are obtained in high yields and with excellent stereoselectivity (up to 99% ee, dr >20:1 for syn) through the organocatalytic direct Mannichreaction of 3-fluoro-oxindoles as fluoroenolate precursors and α-amidosulfones as the bench-stable precursors of sensitive imines by using a chiral oligoethylene glycol
Catalytic Enantioselective and Diastereoselective Allylic Alkylation with Fluoroenolates: Efficient Access to C3‐Fluorinated and All‐Carbon Quaternary Oxindoles
作者:Kaluvu Balaraman、Christian Wolf
DOI:10.1002/anie.201608752
日期:2017.1.24
diastereo‐, and regioselectivity through catalytic asymmetric fluoroenolate alkylation with allylic acetates. The reaction proceeds undermildconditions and can be scaled up without compromising the asymmetric induction. The unique synthetic usefulness of the products is highlighted by the incorporation of additional functionalities and the formation of 3‐fluorinated oxindoles exhibiting an array of
Enantioselective direct Mannich reactions of 3-substituted oxindoles catalyzed by chiral phosphine via dual-reagent catalysis
作者:Qiaowen Jin、Changwu Zheng、Gang Zhao、Gang Zou
DOI:10.1016/j.tet.2018.06.030
日期:2018.7
combination of an amino acid-derived chiral phosphine catalyst and methyl acrylate to catalyze the direct Mannich reaction of 3-substituted oxindoles and imines has been reported to afford 3-tetrasubstituted oxindole derivatives which are key structures for biological activities. The products are formed with a quaternarycarbon and featured with two adjacent chiral centers. Various N-EDG(electron-donating
Enantioselective conjugate addition of 3-fluoro-oxindoles to vinyl sulfone: an organocatalytic access to chiral 3-fluoro-3-substituted oxindoles
作者:Xiaowei Dou、Yixin Lu
DOI:10.1039/c3ob41267a
日期:——
An organocatalytic conjugate addition of prochiral 3-fluorinated oxindoles to vinyl sulfones was described for the first time. In the presence of bifunctional tertiary amine–thiourea catalysts, 3-fluoro-3-substituted oxindole adducts were obtained in excellent yields and with high enantiomeric excesses.